A compact multi-planet system around a bright nearby star from the Dispersed Matter Planet Project
arXiv:1912.10792 · doi:10.1038/s41550-019-0974-x
Abstract
The Dispersed Matter Planet Project targets stars with anomalously low Ca II H&K chromospheric emission. High precision, high cadence radial velocity measurements of the F8V star HD 38677 / DMPP-1 reveal four short period planets. DMPP-1 has log(R'HK) = -5.16 which probably indicates the presence of circumstellar absorbing gas arising from an ablating hot planet. The planets have P ~ 2.9 - 19 d, i.e., a compact planetary system with super-Earth (~3 M) to Neptune-mass (~24 M) planets. These irradiated planets may be chthonian: remnant cores of giant planets after mass-loss while crossing the Neptune desert. Modelling the possible long-term activity indicators while searching for Keplerian signals modifies the recovered planetary signals. A priori inferences about the presence of short period planets allowed the efficient discovery of the DMPP-1 planets. They have great potential for novel and informative follow-up characterisation studies.
arXiv commentAccepted for publication by Nature Astronomy on 12th November 2019 (Main article, Methods and Supplementary Information; 24 pages, 10 figures, 3 tables)
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